IMAGE FORMING APPARATUS

Developing device which can detect rotational position of developing roller

Sensor device, toner concentration detection method and image forming apparatus

Toner adjusting mechanism and image forming apparatus

Image forming apparatus comprising a plurality of rotatable sheet members to determine amount of developer by capacitive means

Method to operate a printer given exchange of a reservoir

Developing device, image forming apparatus and toner concentration detecting method using LC oscillator circuit

Image forming apparatus

Image forming apparatus having developer stirring control

Image forming apparatus

Image forming device and method of adjusting density of formed image